Injection Molding
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Insufficient flow length ratio in EVA '2079851475616104452
Problem Phenomenon
EVA '2079851475616104452 flow length ratio only 80-100, below 150; thin wall products cannot be filled
Cause Analysis
EVA melt viscosity high with short flow distance; injection temperature too low; injection pressure insufficient; mold runner resistance large
Solution
1) Increase injection temperature to 140-200°C; 2) Increase injection pressure to 80-100MPa; 3) Enlarge runner and gate size to reduce resistance; 4) Add 0.3-0.5wt% flow aid to reduce viscosity
Key Takeaway
Insufficient flow length ratio is caused by EVA high viscosity; high temperature, high pressure and large gate are key
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